It provides a few annotation features including Highlight, Draw, and Erase using which you can draw annotations on a PDF document. You can also rotate pages of a PDF document in Edge.

Microsoft is updating the PDF reader in the Edge browser with a useful new feature to help you annotate PDFs and highlight sections that might be locked.

You can easily highlight a PDF on your Mac computer using the markup tools in the built-in Preview program.

If you want to extract highlighted text from PDF file as a plain text file, then this post covers some good free PDF Highlight Extractor software to do that.